JP2014527925A - New jigsaw - Google Patents

Abstract

The first transmission roller includes a head (1), a motor, a first transmission roller interlocking with the motor output end (3), and a first reciprocating rod (71) to which the first blade (101) is fixed. One end of (61) is eccentric and hinged, and the other end of the first connecting rod (61) is hinged to the first reciprocating rod (71). The second transmission roller includes an interlocking second transmission roller, the second transmission roller is eccentrically connected to one end of the second connecting rod (62), and the second blade (102) is fixed to the other end of the second connecting rod (62). There is further provided a linear positioning mechanism that is hinged to the second reciprocating rod (72) and that can linearly move the first reciprocating rod (71) and the second reciprocating rod (72) while maintaining a distance therebetween. The first blade (101) and the second blade (102) are sandwiched between inner surfaces adjacent to each other at the lower portions of the first reciprocating rod (71) and the second reciprocating rod (72), respectively, The directions of the linear reciprocation of the second blade are opposite to each other. The present invention employs a symmetrical design of the members, thereby stabilizing the operation of the jigsaw, making the operation freely, and improving the operation efficiency. [Selection] Figure 1

Description

  The present invention relates to a new jigsaw, and more particularly to a new jigsaw having a double blade.

  Electric jigsaws are applied to industries such as automobiles, ships, wooden molds, decoration, leather, etc. as regular tools, and workpieces such as wood, metal, plastic, rubber, etc., are made straight or curved by the reciprocating movement of the blades. In addition to cutting, slope cutting is possible by adjusting the left and right angles of the bottom plate.

  At present, electric jigsaws generally realize a reciprocating cutting motion by operating an eccentric cam with a motor and interlocking a reciprocating rod. In the case of a jigsaw transmission mechanism disclosed in China Patent Grant Publication Number CN2016644927U, an eccentric cam and a large gear are assembled concentrically with a gear shaft, and a rotor is mounted on a motor shaft and meshes with the large gear to output torque. Thus, the gear shaft is driven to rotate, the eccentric shaft member is mounted on the eccentric cam, and both are interference-fitted, the eccentric shaft member passes through the rounded rectangular hole of the reciprocating rod, and the blade passes through the blade holder. When the eccentric cam rotates with the reciprocating rod, the rotational motion is converted into a linear reciprocating motion in a vertical plane.

  However, in the case of the above jigsaw, when the reciprocating rod reciprocates, vibrations in the Y-axis and X-axis directions are naturally generated in the entire jigsaw. In order to eliminate such vibrations, it is only necessary to arrange a balance weight in the Y-axis direction. However, conventional jigsaws are difficult to position with such a balance weight alone, and usually adjust the speed according to the operation requirements. Therefore, it is more difficult to achieve a balance when adjusted to different speeds, and it is not easy to place balance weights in the X-axis direction more than the Y-axis direction. In addition, such a unidirectional saw blade can be cut only when the blade is lifted. At this time, the entire jigsaw is in a sunk state, and all of this sunk force is received by the base. Since it moves, vertical reciprocation appears in the base, and it becomes difficult to maintain dynamic balance during operation, which affects use.

  An object of the present invention is to provide a new jigsaw that has a stable cutting operation, is freely operable, and has high operation efficiency.

  The present invention uses the following technical scheme in order to solve the above technical problem. In other words, the new jigsaw includes a head, a motor disposed in the head, a first transmission roller interlocked with the motor output end of the motor, a first connecting rod, and a first reciprocating rod to which the first blade is fixed, The first transmission roller is eccentrically connected to one end of the first connecting rod and hinged, the other end of the first connecting rod is hinged to the first reciprocating rod, and further, a second transmission roller interlocked with the motor output end, A second connecting rod and a second reciprocating rod to which the second blade is fixed, wherein the second transmission roller is eccentrically connected to one end of the second connecting rod, and the other end of the second connecting rod is a second reciprocating rod. A linear positioning mechanism hinged to the rod and capable of linearly moving the first reciprocating rod and the second reciprocating rod while maintaining a distance; The blade and the second blade are sandwiched between inner surfaces adjacent to each other at the lower portions of the first reciprocating rod and the second reciprocating rod, respectively, and the directions of the linear reciprocating motion of the first blade and the second blade are opposite to each other. It is characterized by being.

  The first and second transmission rollers are a first large gear and a second large gear that directly mesh with the motor output end, respectively, and the first large gear and the second large gear are arranged on a coaxial line. The portions of the first connecting rod and the second connecting rod which are eccentrically hinged are preferably arranged symmetrically with respect to the axis, and such an arrangement structure is simple and convenient for mounting. Needless to say, the transmission roller may realize transmission by a sprocket or the like if space conditions permit.

  The first large gear and the second large gear are provided with a first eccentric hole and a second eccentric hole, respectively, and a first pin shaft that fits in the first eccentric hole and the second eccentric hole; Second pin shafts are provided, and one ends of the first connecting rod and the second connecting rod are hinged to the first pin shaft and the second pin shaft, respectively. The eccentric hinge connection is realized.

  The linear positioning mechanism includes an upper slide rail that prevents back and forth movement of the first reciprocating rod and the second reciprocating rod, and a lower slide rail that prevents left and right movement of the first reciprocating rod and the second reciprocating rod. Including. By regulating the movement of the reciprocating rod in both directions, not only the linear reciprocating movement of the reciprocating rod is ensured, but the distance between the reciprocating rods is kept constant, which is advantageous for the movement of the blade.

  There are two upper slide rails that prevent the reciprocating rod from moving back and forth, and they are arranged opposite to each other. A U-shaped groove extending in the vertical direction is provided at the center of each upper slide rail, and the first reciprocating rod is provided. The upper part of the rod and the second reciprocating rod is disposed in each U-shaped groove.

  There are two lower slide rails that prevent the reciprocating rod from moving left and right, and the lower slide rails are arranged opposite to each other, and each of the lower slide rails includes three protrusions extending inward, and the two lower slide rails are Two slots extending in the lateral direction are formed, and the upper portions of the first reciprocating rod and the second reciprocating rod are respectively disposed in the slots.

  According to one aspect of the present invention, a blade crimping block is removably fastened to both front and rear surfaces of the lower part of at least one of the first and second reciprocating rods. Between the blade crimping blocks, there are formed nipping grooves that are located on the lower inner surface of the corresponding reciprocating rod and into which the corresponding blade is inserted.

  According to another aspect of the present invention, a blade crimping block is detachably fastened to a front surface or a rear surface of a lower portion of at least one of the first and second reciprocating rods. Between the block and the notch on the lower inner surface of the corresponding reciprocating rod, a nipping groove into which the corresponding blade is inserted is formed.

  The two blades solve the problem that it is difficult to attach the blades of the double blade jigsaw in the prior art by using the above-mentioned two types of methods of holding the blades obliquely and laterally instead of the method of holding the two blades at the front. In addition, since the width of the sandwiching groove can be adjusted, the blade can be securely fixed and the blade can be prevented from being damaged by the sandwiching.

  The narrow groove has a tapered cross section, and the contraction opening end of the tapered narrow groove is separated from the inner surface of the corresponding reciprocating rod, so that the blade can be further prevented from loosening.

  The jigsaw further includes a guide roller bracket unit for restricting movement of the first blade and the second blade, and the guide roller bracket unit includes a guide roller bracket connecting rod fixedly disposed, and the guide roller Two guide rollers arranged in parallel are attached to the lower end of the bracket connecting rod so as to rotate via guide roller pins, and a guide roller spacer is provided in the guide roller pin portion between the two guide rollers. A guide groove is formed between the two guide rollers and the guide roller spacer, through which the first blade and the second blade are inserted. This makes it possible to further support and guide the movement of the two blades, to ensure the stable maintenance of the linear movement in the two blades and to ensure that the appropriate distance between the two blades performing the cutting is maintained, It is possible to move up and down without interfering with each other even though they are close to each other.

  Compared with the prior art, the present invention has the following advantages. The motor of the present invention operates two transmission rollers at the same time, and interlocks the two connecting rods to enable two-way symmetrical reciprocation of the two reciprocating rods. Therefore, when one blade moves upward, Since the other blade moves downward, the device receives both upward and downward forces at the same time, and the total external force received by the device is almost zero, so the phenomenon of lack of balance can occur. Disappear. Therefore, according to the present invention, the vibration of the equipment due to the cutting is obviously reduced, so that the cutting is stable, the efficiency is increased, the operation is safe, and the flexibility of cutting is possible even in the operating situation without the bottom plate. Maintained. Next, it is difficult to attach the double-blade jigsaw in the prior art by using a method in which the two blades are not sandwiched between the two blades at the front, but are sandwiched laterally by a groove having a tapered cross section. It solves the problem that there is, and the double blade work of the jigsaw becomes smooth.

FIG. 1 is a cross-sectional view of an embodiment of the present invention. FIG. 2 is a schematic diagram showing the structure of two reciprocating rods and blades in the embodiment of the present invention. FIG. 3 is a schematic diagram showing the structure of two reciprocating rods in the embodiment of the present invention. FIG. 4 is a schematic diagram showing the structure of the transmission mechanism in the embodiment of the present invention. FIG. 5 is a schematic view showing an exploded structure of the reciprocating rod and the slide rail in the embodiment of the present invention. 6 is a cross-sectional view of the guide roller bracket unit of FIG.

  Hereinafter, the present invention will be described in more detail with reference to the drawings and examples.

  Referring to FIG. 1, the new jigsaw includes a head 1 that is a housing structure, a head cover 2 that is a cover plate of the housing structure and is disposed on the head 1, and a motor as a power source disposed in the head 1. Including.

  The power output from the motor is transmitted to the cutting blade through the transmission mechanism and is subjected to reciprocating motion. A first transmission roller and a second transmission roller are provided as transmission rollers that are linked to the motor output end 3 of the motor. In the present embodiment, the first transmission roller and the second transmission roller are a first large gear 41 and a second large gear 42 that directly mesh with the motor output end 3, respectively. An eccentric hole 411 and a second eccentric hole 421 are provided. In the first eccentric hole 411 and the second eccentric hole 421, a suitable first pin shaft 51 and a second pin shaft 52 are provided, respectively. One end of the first connecting rod 61 is hinged to the first pin shaft 51, the other end is hinged to the upper end of the first reciprocating rod 71, and one end of the second connecting rod 62 is hinged to the second pin shaft 52. The other end is hinged to the upper end of the second reciprocating rod 72. In the present embodiment, the two reciprocating rods are both L-shaped. Referring to FIGS. 2 and 4, the first blade crimping block 81 is provided on both the front and rear surfaces of the lateral portion of the first reciprocating rod 71. A second blade crimping block 82 is provided on the lower front surface of the second reciprocating rod 72. The first blade 101 is formed in the first nipping groove 111 formed between the two first blade crimping blocks 81 and located on the lower inner surface of the first reciprocating rod 71 (surface close to the second reciprocating rod 72). Then, the first blade 101 is fixed by tightening the two first blade crimping blocks 81 with the first bolts 91, and the second blade 102 is connected to the second blade crimping block 82 and the second reciprocating rod 72. It is inserted into the second sandwiching groove 112 formed between the inner side surfaces (surface close to the first reciprocating rod 71), and then the second blade crimping block 82 and the second reciprocating rod 72 are moved by the second bolt 92. The second blade 102 is fixed by tightening. According to such a fixing method, since the width of the pinching groove can be adjusted, the blade can be reliably fixed in the pinching groove, and damage to the blade due to pinching can be prevented. Preferably, referring to FIG. 3, the first and second sandwiching grooves 111 and 112 are tapered in cross section, and the contraction port end is separated from the inner surface of the corresponding reciprocating rod so that the blade can be more securely mounted. Fix and prevent blade loosening during operation. The above-mentioned two blades solved the problem that it was difficult to attach the blade of a double blade jigsaw in the prior art by using a method of holding the blades at an angle rather than a method of holding the two blades at the front. Instead, the first reciprocating rod 71 and the second reciprocating rod 72 may have the same shape, and the blade may be clamped in the same manner.

  In order for the movement trajectory of the two reciprocating rods to maintain a linear motion, the reciprocating rod is provided with a linear positioning mechanism. Referring to FIGS. 4 and 5, the two upper slide rails 12 and the lower slide rail 13 are Two upper slide rails 12 are arranged opposite to each other, and a U-shaped groove 121 extending in the vertical direction is provided at the center of each upper slide rail 12, and the first reciprocating rod 71 and the second reciprocating rod are provided. Since the upper part of 72 is disposed in the U-shaped groove 121 of each upper slide rail 12, the movement of the two reciprocating rods in the front-rear direction (direction perpendicular to the paper surface when viewed on the paper) is prevented. The two lower slide rails 13 are opposed to each other, and each has three protrusions 131 extending inward (side of the other lower slide rail). Therefore, the two lower slide rails 13 have two reciprocating rods. Two slots 132 extending in the lateral direction for positioning are formed, and the upper portions of the first reciprocating rod 71 and the second reciprocating rod 72 are arranged in the slots 132, respectively, so that the two reciprocating rods in the lateral direction Movement is prevented. For this reason, not only the linear reciprocating motion of the reciprocating rod is ensured but also the distance between the reciprocating rods is kept constant, which is advantageous for the movement of the blade.

  As shown in FIGS. 1 and 6, the jig saw is further provided with a guide roller bracket unit. The guide roller bracket connecting rod 14 is fixedly arranged, and two guide rollers 141 arranged in parallel are attached to the lower end of the guide roller bracket connecting rod 14 via a guide roller pin 142, and one end of the guide roller pin 142 is An opening retainer ring 143 is arranged to prevent the two guide rollers 141 from sliding outward. A guide roller spacer 144 is provided in a guide roller pin 142 portion between the two guide rollers 141, and a guide groove 145 through which two blades are inserted between the two guide rollers 141 and the guide roller spacer 144, respectively. Is formed. As a result, the motion trajectory of the two blades maintains a linear motion, and at the same time, an appropriate distance is maintained between the two blades that perform the cutting, and the vertical motion can be freely performed without interfering with each other. .

  When the motor is energized, the motor output end 3 is rotated accordingly, and the two large gears engaged with each other are rotated. However, the connecting rods are eccentrically connected to the large gears by hinges. One end will make a circular motion, and the other end of the two connecting rods will move the two reciprocating rods, respectively. Since the upper slide rail 12 and the lower slide rail 13 regulate the movement direction of the two reciprocating rods, that is, only allow the linear movement in the vertical direction, the linear movement of the two reciprocating rods causes the linear movement of the two blades, respectively. Brought and subjected to cutting. In this embodiment, the two large gears are arranged on the same axis, and the eccentric holes are arranged symmetrically with respect to the axis of the large gear in the initial state. It can be reversed. However, it is not necessary to use the coaxial arrangement of the two large gears or the symmetrical arrangement of the two eccentric holes, and the motor output end 3 realizes the interlocking with the large gear via the gear or other transmission mechanism. In particular, it is only necessary that the movement directions of the two blades can be opposite to each other.

Phenomenon of lack of balance due to symmetrical arrangement because the motor operates two eccentric large gears and interlocks the two connecting rods so that the two reciprocating rods combine to perform a vertically symmetric reciprocating motion. Will no longer occur. In addition, when one blade moves upward, the other blade moves downward, so the device receives both upward and downward forces simultaneously, and the total external force received by the device is almost zero. Become. Since the vibration of the device due to the cutting is obviously reduced, the cutting flexibility is maintained even in an operating situation without a bottom plate.

Claims (10)

The head (1), the motor disposed in the head (1), the first transmission roller interlocked with the motor output end (3) of the motor, the first connecting rod (61), and the first blade (101) are fixed. The first transmission roller is eccentrically connected to one end of the first connecting rod (61) and hinged, and the other end of the first connecting rod (61) is the first reciprocating rod (71). A new jigsaw that is hinged to
Further, the second transmission roller includes a second transmission roller interlocking with the motor output end (3), a second connecting rod (62), and a second reciprocating rod (72) to which the second blade (102) is fixed. The roller is eccentrically connected to one end of the second connecting rod (62) and hinged, and the other end of the second connecting rod (62) is hinged to the second reciprocating rod (72).
In addition, a linear positioning mechanism capable of linearly moving the first reciprocating rod (71) and the second reciprocating rod (72) while maintaining a gap is further provided, and the first blade (101) and the second blade ( 102) are sandwiched between inner surfaces adjacent to each other at the lower portions of the first reciprocating rod (71) and the second reciprocating rod (72), respectively, and the first blade (101) and the second blade (102). A new jigsaw characterized in that the directions of linear reciprocation are opposite to each other.   The first and second transmission rollers are a first large gear (41) and a second large gear (42) that directly mesh with the motor output end (3), respectively, and the first large gear (41). And the second large gear (42) are arranged on a coaxial line, and the first connecting rod (61) and the second connecting rod (62) are eccentrically and hingedly connected to each other with respect to the axis. The new jigsaw according to claim 1, wherein:   The first large gear (41) and the second large gear (42) are respectively provided with a first eccentric hole (411) and a second eccentric hole (421), and the first eccentric hole (411). In the second eccentric hole (421), a suitable first pin shaft (51) and a second pin shaft (52) are provided, respectively, and the first connecting rod (61) and the second connecting shaft are provided. The new jigsaw according to claim 2, wherein one end of the rod (62) is hinged to the first pin shaft (51) and the second pin shaft (52), respectively.   The linear positioning mechanism includes an upper slide rail (12) that prevents back and forth movement of the first reciprocating rod (71) and the second reciprocating rod (72), and the first reciprocating rod (71) and the second reciprocating rod. The new jigsaw according to claim 1, further comprising a lower slide rail (13) for preventing the reciprocating rod (72) from moving side to side.   The upper slide rails (12) are two and are arranged to face each other, and a U-shaped groove (121) extending in the vertical direction is provided at the center of each upper slide rail (12), and the first reciprocating rod 5. The new jigsaw according to claim 4, wherein upper portions of the first reciprocating rod and the second reciprocating rod are respectively disposed in the U-shaped grooves.   There are two lower slide rails (13) and are arranged opposite to each other, and each of the lower slide rails (13) includes three protrusions (131) extending inward, and the two lower slide rails (13). ) Constitutes two slots (132) extending in the lateral direction, and the upper portions of the first reciprocating rod (71) and the second reciprocating rod (72) are respectively disposed in the slots (132). The new jigsaw according to claim 4, wherein:   A blade crimping block is detachably fastened to both front and rear surfaces of the lower part of at least one of the first and second reciprocating rods (71, 72). 2. A new jigsaw according to claim 1, wherein a sandwiching groove is formed between the lower reciprocating rod and the corresponding blade is inserted in between.   A blade crimping block is detachably fastened to a front surface or a rear surface of a lower portion of at least one of the first and second reciprocating rods (71, 72). The new jigsaw according to claim 1, wherein a nipping groove into which a corresponding blade is inserted is formed between the notch on the lower inner surface of the rod.   9. The new jigsaw according to claim 7, wherein the sandwiching groove has a tapered cross section, and a contraction port end of the tapered sandwiching groove is separated from an inner surface of a corresponding reciprocating rod.   The jigsaw further includes a guide roller bracket unit for restricting movement of the first blade (101) and the second blade (102), and the guide roller bracket unit is a guide roller bracket connecting rod fixedly arranged. (14), two guide rollers (141) arranged in parallel are attached to the lower end of the guide roller bracket connecting rod (14) so as to rotate via guide roller pins (142), A guide roller spacer (144) is provided at a portion of the guide roller pin (142) between the two guide rollers (141), and between the two guide rollers (141) and the guide roller spacer (144). Respectively, the first blade (101) and the second New jigsaw according to any one of claims 1 to 8, characterized in that the guide groove grade (102) is inserted (145) is formed.

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